To see if your fuel line is clear to the tank try blowing in it or put a low pressure air line into the fuel line. If you can blow in it, it isn't plugged and if there is gas in it you should hear it bubble inside the tank. If you have now cleared the line the gas may come back out at you now, so be careful. You could also try rapping on the tank and see if there is gas in it. Start at the top and work your way to the bottom, you should here a change in pitch if there is gas still in the tank.
